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2 years ago

For something to combust, it must have ____________.

Chemistry

2 answers:

Wewaii [24]2 years ago

8 0

The answer would be B

docker41 [41]2 years ago

6 0

$╰┈➤\: \huge\color{pink}{\bold{Answer}}$

For something to combust, it must have Oxygen

A. Carbon dioxide
B. Oxygen
C. Water
D. Nitrogen

$\: \: \:$

$╰┈➤\: \huge\color{pink}{\bold{Explanation}}$

We don't have to keep lighting a campfire, it just keep burning

To summarize, for combustion to occur three things must be present: a fuel to be burned, a source of oxygen, and a source of heat

$\: \: \:$

So choose letter B

$\color{pink}──────────────────────────────$

$\mathfrak \red{ - \: Cherrrry \: Red}$

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3 years ago

A filament of a light bulb is made from a pure sample of tungsten.

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The correct options are:

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2) Element.

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3) false by definition of mixture.

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3 years ago

A sample of gaseous neon atoms at atmospheric pressure and 0 °c contains 2.69 * 1022 atoms per liter. the atomic radius of neon

omeli [17]

Explanation

Radius of neon atom : 69 pm = $69\times 10^{-12} m$

Volume occupied by the one atom: $\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times 3.14\times(69\times 10^{-12} m)^3=1.37\times 10^{-30} m^3$

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Fraction of volume occupied by the neon atom:

$=\frac{3.68\times 10^{-8} m^3}{0.001 m^3}=3.68\times 10^{-11} m^3$

$3.68\times 10^{-11} m^3$

The fraction of of volume occupied by the neon atom is very less than the 1 L which indicates the presence of large amount of empty space between the atoms of the gas.

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